A digital computer program was developed which models soil-water systems with respect to nitrogen transformations, including hydrolysis of urea, immobilization-mineralization of ammonia and organic nitrogen, and immobilization of nitrate nitrogen. Transformation rate equations were derived by applying techniques of systems and statistical analysis and using selected data from the literature. Simultaneous integration of the equations over time generates predicted concentrations for urea-N, organic-N, ammonia-N, and nitrate-N in the system. Comparisons were made of predicted and observed data for several soils having different textures and various moisture contents, temperatures, and fertilizer applications. This procedure yielded simple correlation coefficients of 0.992, 0.768, 0.969, and 0.972 for the previously mentioned nitrogenous types, respectively.

A digital computer program was developed which models soil-water systems with respect to nitrogen transformations, including hydrolysis of urea, immobilization-mineralization of ammonia and organic nitrogen, and immobilization of nitrate nitrogen. Transformation rate equations were derived by applying techniques of systems and statistical analysis and using selected data from the literature. Simultaneous integration of the equations over time generates predicted concentrations for urea-N, organic-N, ammonia-N, and nitrate-N in the system. Comparisons were made of predicted and observed data for several soils having different textures and various moisture contents, temperatures, and fertilizer applications. This procedure yielded simple correlation coefficients of 0.992, 0.768, 0.969, and 0.972 for the previously mentioned nitrogenous types, respectively.

en_US

dc.description.note

hydrology collection

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dc.type

Thesis-Reproduction (electronic)

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dc.type

text

en_US

dc.subject.lcsh

Hydrology.

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dc.subject.lcsh

Soils -- Nitrogen content.

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dc.subject.lcsh

Alkali lands.

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thesis.degree.name

M.S.

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thesis.degree.level

masters

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thesis.degree.discipline

Hydrology and Water Resources

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thesis.degree.discipline

Graduate College

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thesis.degree.grantor

University of Arizona

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dc.contributor.chair

Dutt, Gordon R.

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dc.contributor.committeemember

Wright, Jerome J.

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dc.contributor.committeemember

Evans, Daniel D.

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dc.identifier.oclc

213415647

en_US

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